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Posted: 4/28/2010 3:43:23 PM EDT
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All the reloading manuals include data for .223 chamber dimensions. Max case length in my Speer manual is 1.76 with a trim to of 1.75.
My rifle has a 5.56 chamber. With the additional tolerance of the 5.56 chamber, could a max case length of 1.77 safely be used? Any input? |
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As far as trim length goes 5.56mm and .223 are the same. Some chamber reamers allow more room than others, but why push your luck? If you really want to know the absolute maximum case length for your rifle Sinclair International sells a measuring spud.
It requires that you sacrifice one case (it doesn't have to be good for reloading, it can be any .223 case) by dramatically shortening the case neck. The spud then slips into the case and when you close the bolt it is held by neck tension. You can then measure it and find your exact maximum case length for that rifle. Or you can just trim whenever you get to 1.760", that's what I do. Actually I trim every time I resize because it's almost fun with a Giraud or Gracey trimmer and I no longer have to worry about checking each case. Trimming takes less time and effort than checking if you have the right tools. |
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Quoted:
All the reloading manuals include data for .223 chamber dimensions. Max case length in my Speer manual is 1.76 with a trim to of 1.75. My rifle has a 5.56 chamber. With the additional tolerance of the 5.56 chamber, could a max case length of 1.77 safely be used? Any input? Sinclair sells a reuseable chamber plug that will tell you just how far you can let your ncks grow. It costs about $9 and you have to kill a piece of brass. It's a no brainer. Chris ETA: Sorry BP, I skimmed over your post. |
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